<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2016/9/28 0028
 * Time: 下午 7:49
 */
header('Content-type:text/html;charset=utf-8');
function getFileExt($path){
    $ext = substr($path,strrpos($path,'.') +1);
    return $ext;
}
$path = 'C:\images\apple.jpg';
$ext = getFileExt($path);
echo "<p>文件路径：$path</p>";
echo"<p>文件后缀：$ext</p>";